Susanne Schmeier has not received funding related to this article. Melissa McCracken has not received funding related to this article. Just over half the world’s population shares a river or ...

Lake Baikal measures 12,239 square miles (31,700 square kilometers), making it Earth's seventh-largest lake.It is not only the world's oldest lake but also the deepest one, at about 1 mile (1.6 ...